seepage noun2 •The process by which something, especially a liquid, leaks through a porous substance; the process of seeping. (Also used figuratively: the process of diffusing.)[…] while they all admit that the most serious losses occur by seepage of gas from, and oil into, the combustion-chamber and that this seepage is […] — 1922 •Water that has seeped or oozed through a porous soil. formsseepages
